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Monthly sea level peak for January 2021

The lunar month’s highest tide occurred between 14th and 18th January 2021 for Waitemata harbour and Great Barrier Island.

The Waitemata harbour tidal gauge measured a mean level of 1.54 metres between 09:45am and 10:00am on 15th January which is 16cm below the January average 2015-2020). The barometric air pressure at the time of the reading was 1014.0 hPa, so when using the inverted barometric adjustment calculation method of 1cm for every 1 hPa, the projected height would have been 1.55 metres at the mean sea level pressure of 1013 hPa. More on meteorological effects on tides can be found here.

The ongoing trend between 2014 to 2021 for the Waitemata harbour sea level peak is flat. The tidal gauge data used for this analysis can be found here.


The Great Barrier Island tidal gauge measured a mean level of 1.05 metres between 09:15am and 09:30am on 15th January. The air pressure at the time of the reading was 1014.6 hPa, so when using the inverted barometric adjustment calculation method of 1cm for every 1 hPa, the projected height would have been 1.07 metres at the mean sea level pressure of 1013 hPa. More on meteorological effects on tides can be found here.

The ongoing trend between 2014 to 2021 for Great Barrier Island sea level peak is a slight upward trend. The tidal gauge data used for this analysis can be found here.



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